Workout #9 of 2011!

I just did Level 1 of 6 Week Six-Pack.  This was only my 2nd time to do it so it's definitely still a challenge.  This is not a workout I would recommend for someone to start out with when s/he is out of shape and/or has weak arms.  My arms are not nearly as weak as they were a year ago but they are currently shaking from the plank moves.  My wrists feel a little shaky too.  Even though Jillian recommends doing level 1 five days a week for 3 weeks and then level 2 five days a week for 3 weeks, I think I will only do it once a week (if that).  I'm not sure my wrists can handle the hard work they got tonight on a daily basis.  I have notoriously weak joints that I just can't afford to mess up.